The C++ API is very well documented and easy to use even if you are new to the library. I am working on implementing word embeddings using MeTA. Very good documentation is available online which makes it easy to implement an algorithm from scratch. I have not used any other libraries for this purpose so cannot compare with others. But I think MeTA has all the features required to build a robust system. If I were building such a system, MeTA would be my choice. Word embedding using MeTA will help in solving problems related to word similarity.